Remove platform specific ref-test expectations for chromium as ref-tests appears...

Remove platform specific ref-test expectations for chromium as ref-tests appears not to support platform specific results.

* platform/chromium/fast/regions/floats-basic-in-variable-width-regions-expected.html: Removed.
* platform/chromium/fast/regions/overflow-in-uniform-regions-expected.html: Removed.
* platform/chromium/fast/regions/render-region-renderer-expected.html: Removed.
* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117893 268f45cc-cd09-0410-ab3c-d52691b4dbfc